Does anyone make a Mica insulator for a TO-3P package? All I can find is the silicone pads from Parts Express.

In another thread Kapton tape was discussed, but the price is outragous, and 33m is waayyyy more than I'll ever need. Even if the price was acceptable, the only width I can find is .75" (Digikey), which isn't wide enough for a TO-3P device.

I'm getting pretty frustrated...why is a plain-old Mica insulator impossible to find? Should I just give up and order the silicone pad from Parts Express and hope it's good enough?

Originally posted by EchoWars Does anyone make a Mica insulator for a TO-3P package? All I can find is the silicone pads from Parts Express.

In another thread Kapton tape was discussed, but the price is outragous, and 33m is waayyyy more than I'll ever need. Even if the price was acceptable, the only width I can find is .75" (Digikey), which isn't wide enough for a TO-3P device.

I'm getting pretty frustrated...why is a plain-old Mica insulator impossible to find? Should I just give up and order the silicone pad from Parts Express and hope it's good enough?

They are available - I think Digikey has them. If the application
is critical and high power, use the micas and grease. If the heat
sink is bead blasted or otherwise frosted finish and you have
high power, use micas and grease. Otherwise the silicone
products are fine.

The ESP website sells Kapton tape by the meter. I picked some up there. The site states that is enough for mounting about 33 transistors. Haven's used it yet though but folks seem to like it and think the heat transfer is better than Mica.

Digikey sells the sil-pads and variations of, but seemingly not for TO-3P's. They do not have mica for anything other than TO-220 and TO-3, and perhaps one or two others, but not TO-3P. Bummer.

electron...

I may do that. I just sent a request for samples from Aavid, and if I get them I think I'll be the only one on the planet using mica for TO-3P. If I can't get them, I guess I'll settle for Parts Express sil-pads.